missing libobjc.so

I am using gcc45 for ports and have made the necessary changes described here: http://www.freebsd.org/doc/en/articles/custom-gcc/article.html; including modification of libmap.conf as:
Code:
libobjc.so.3    gcc45/libobjc.so.3
However, /usr/local/lib/gcc45 has no such file nor anything similar. There is a /usr/lib/libobjc.so.4 how should I fix this - just cp or ln? Changing libmap.conf entry to so.4 makes no difference for this error:
Code:
depends on file: /usr/local/lib/gcc42/libobjc.so - not found
should I just
# mkdir -p /usr/local/lib/gcc42/
# ln -s /usr/lib/libobjc.so.4 libobj.so
 
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